Article
Engineering, Mechanical
T. N. Chakherlou, P. Shahriary, A. Akbari
Summary: This paper investigated the fretting fatigue behavior of cold expanded plates, revealing that high levels of cold expansion affect the frictional force on the contact interface and result in fretting fatigue occurring more likely away from the holes. Cold expansion also generates tensile residual stress at areas away from the hole edge, which when superimposed on fatigue load intensifies stress severity and reduces fretting fatigue life. The intensity of tensile residual stress increases with higher levels of cold expansion, expecting lower fretting fatigue life on larger cold expanded plates.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Mechanics
Hemanth Thandaga Nagaraju, Bhavani Sankar, Nam-Ho Kim, Ghatu Subhash
Summary: It is easier to generate finite element meshes of complicated geometries using voxel-based meshes compared to conformal meshes. However, voxel-based meshes tend to have higher local stresses due to artificial stress concentration caused by jagged lines approximating a curve. In this study, we propose a method that addresses this issue and accurately predicts the maximum von Mises stress in voxel-based meshes. The method is based on the variation of reciprocal of stresses and associated numerical gradient. We compare the prediction of the proposed method with results from a conformal mesh and verify its accuracy using different mesh densities, material properties, and integration schemes.
COMPOSITE STRUCTURES
(2022)
Article
Anatomy & Morphology
Sarah Jamison-Todd, Benjamin C. Moon, Andre J. Rowe, Matt Williams, Michael J. Benton
Summary: Jurassic ichthyosaurs dominated upper trophic levels of marine ecosystems, and different species exhibited adaptations in cranial morphology, dentition, and stress distribution to specialize in different dietary resources, suggesting niche partitioning.
JOURNAL OF ANATOMY
(2022)
Article
Engineering, Electrical & Electronic
Qingshan Jiang, Zhiwen Zhao, Zhilong Xu, Jie Sun, Xiuyu Chen, Bosheng Su, Zhenye Zhao, Wanbiao Jiang
Summary: This study used ABAQUS software to establish a simulation model for steel wheels, and predicted their fatigue life by calculating residual stress and maximum stress. The results showed that the superimposed residual stress increased the maximum stress but decreased the fatigue life, providing a theoretical basis for the design and process improvement of automotive steel wheels.
Article
Acoustics
Baik Jin Kim, Joseph Oh, Alan Palazzolo
Summary: A novel approach of modeling Curvic couplings, which combines a GW contact model with a 3D solid element model of flexible teeth and coupling rings, is proposed in this paper. The proposed approach improves the accuracy of rotordynamic vibration predictions compared to similar approaches that assume rigid teeth and rings or omit a surface roughness - asperity model.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Atefe Geramian, Jorge Castro, Mahmoud Ghazavi, Marina Miranda
Summary: This paper presents the results of 3D finite element analyses on the installation effects of groups of stone columns in cohesive soils. The numerical simulations show that stone column installation increases horizontal stresses and pore pressures in the surrounding soil. The installation effects of multiple columns overlap and accumulate, resulting in higher horizontal stresses and pore pressures in a larger area. The installation sequence mainly affects the radial stresses around the last installed column.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Civil
Qingpeng Zeng, Yanjun Li, Sungen Gong, Xu Chen, Baozhi Sun, Yuanwei Cao, Jianxin Shi
Summary: This study investigates the residual stress distribution on the boiler drum and evaluates its impact on fatigue life. The results show that the residual stress is higher in the central region and lower on the sides. Considering the post-expansion residual stress, there is a reduction of 10.4%/20% and 8.9% in the permissible number of cycles based on the maximum shear stress and distortion energy theories, respectively.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Cheng-jin Wu, Song Cen, Ru-xia Ma, Chen-feng Li
Summary: A high-performance shape-free arbitrary polygonal hybrid stress/displacement-function flat shell finite element method is proposed for linear and geometrically nonlinear analyses of shells. The method constructs an arbitrary polygonal flat shell element by assembling plate and membrane elements, and designs a proper best-fit corotated frame for geometrically nonlinear polygonal elements. Numerical examples demonstrate excellent performance and flexibility of the new element in dealing with complex loading distributions and mesh shapes.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2021)
Review
Materials Science, Multidisciplinary
H. Kursat Celik, Simay Koc, Alper Kustarci, Allan E. W. Rennie
Summary: Finite element analysis (FEA) is commonly used in dentistry research to analyze structures such as implants, prosthetics, and restorations. This study reviewed material properties data related to tooth components and found inconsistencies in values used in different FEA studies. Further research is needed to standardize material properties and ensure the accuracy of FEA studies in dental research.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Michele Ferraiuolo, Michele Perrella, Venanzio Giannella, Roberto Citarella
Summary: The HYPROB Program, funded by the Italian Ministry of University and Research, aims to develop regeneratively cooled liquid rocket engines using oxygen-methane propellant. The study focused on the thermal-mechanical behavior of the thrust chamber cooling channels in the HYPROB final ground demonstrator. The main cause of failure was identified as low-cycle fatigue (LCF), with corresponding calculations of the number of loading cycles to failure.
APPLIED SCIENCES-BASEL
(2022)
Article
Geography, Physical
Abigail Kelly, Joshua H. Miller, Matthew J. Wooller, C. Tom Seaton, Patrick Druckenmiller, Larisa DeSantis
Summary: In contrast to modern Arctic ecosystems, the high-latitude ecosystems of the Late Pleistocene supported a diverse range of large herbivores, with potential coexistence supported by dietary differences and taphonomic differences suggesting spatial or temporal niche partitioning. Late Pleistocene bison and horses had less abrasive diets than modern obligate grazers, indicating a potential incorporation of more forbs in their diets for these grazers of the mammoth steppe. Dietary niche partitioning alone cannot fully explain the co-occurrence of Late Pleistocene bison and horses, suggesting additional factors such as spatial or temporal niche partitioning.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Ecology
Cody K. Porter, Jimena Golcher-Benavides, Craig W. Benkman
Summary: Dietary partitioning plays a central role in biological communities and its extent varies over time, possibly due to food availability and seasonality. The study found that dietary partitioning is greatest when food abundance is low, implying competition for limited food resources. The extent of dietary partitioning in birds and mammals is also related to seasonal changes in primary productivity.
Article
Materials Science, Multidisciplinary
Wenlong Tian, Xujiang Chao, M. W. Fu, Lehua Qi, Luyan Ju
Summary: This paper proposes a new algorithm for predicting the coefficients of thermal expansion of different composite systems, which guarantees stress and strain continuities on the representative volume elements for certain composites, while satisfying the micro-macro energy balance and zero macro-stress constraint. The proposed algorithm is validated to accurately predict the CTEs of composites through comparison with experimental tests and other numerical methods.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Mechanical
Victor Okenyi, Mahdi Bodaghi, Petros Siegkas, Neil Mansfield, Shukri Afazov
Summary: This research analyzes a 15 MW OWT support structure using analytical and numerical models, and finds that corrosion increases stress levels and changes the location of maximum tensile stress. Predicting stress evolution due to corrosion is important for future OWT designs and fatigue assessments.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2023)
Article
Biology
Russell D. C. Bicknell, James D. Holmes, Gregory D. Edgecombe, Sarah R. Losso, Javier Ortega-Hernandez, Stephen Wroe, John R. Paterson
Summary: The study suggests that Cambrian euarthropods with transversely elongate protopodites bearing short, robust gnathobasic spines were likely durophages, while taxa with shorter protopodites armed with long spines were more likely restricted to a soft food diet.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2021)